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Original question:

TUSB422: TUSB422 alternate package

TUSB422: TUSB422 INT_N escape routing

Jeffrey Kahl
Prodigy 70 points

Part Number: TUSB422

I am currently in layout for a TUSB422-based design and the via for the INT_N ball is the only laser-drilled via in the whole design. My design does not need VCONN support and the VCONN ball is currently unconnected. Is there anything that would preclude routing the INT_N line through the VCONN pad and avoiding the laser-drilled via? Leakage current into/from VCONN when VCONN_EN is disabled is not specified.

  • 0
    TI__Guru**** 183011 points
    Jeffrey

    I would avoid doing this, the trace solder mask may come off and make contact with the VCONN pin. Depending on the height of the trace, you would also potentially create mechanical stability issue. If via is not used, you can use a 2mil trace on the INT_N as being shown in section 10.1 of the datasheet.

    Thanks
    David
  • 0 in reply to David (ASIC) Liu
    Prodigy 70 points

    David,

    Thanks for the reply.

    You misunderstand my point. I don't want to mask over the vconn pad. I want to connect int_n to vconn (since vconn_en will remain disabled), then route to the pull-up and processor input. So my concern is would there be any appreciable leakage from the vconn connection which would interfere with the int_n operation.

    I'll laser drill if I have to, but I'm cost sensitive and I'd like to avoid cost drivers like laser microvias and 2 mil routing.

    Regards,

    Jeff

  • 0 in reply to Jeffrey Kahl
    TI__Guru**** 183011 points
    Jeff

    I will not recommended doing this. If via is cost sensitive, the best option is to route using 2mil width trace.

    Thanks
    David